Patents by Inventor Eisuke Nishiyama
Eisuke Nishiyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7187337Abstract: A slot-line planar antenna has a substrate, an outer conductor disposed on one principal surface of the substrate and having an opening defined therein, an inner conductor disposed on the one principal surface of the substrate and positioned within the opening, the outer conductor and the inner conductor jointly defining a looped aperture line therebetween, and an electronic device electrically interconnecting the outer conductor and the inner conductor for controlling an electromagnetic wave field of a slot line provided by the aperture line.Type: GrantFiled: January 28, 2005Date of Patent: March 6, 2007Assignees: Nihon Dempa Kogyo Co., Ltd, Saga UniversityInventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Patent number: 7095373Abstract: A planar array antenna using a multi-layer substrate having an intermediate layer conductor in a laminated face comprises: four pieces of planar antenna elements disposed at each of geometrically square shaped apexes; first and second slot lines formed in the intermediate layer conductor, and intersecting each other; first to fourth microstrip lines formed along each side of geometrical squares so as to be coupled to each antenna element, and at the same time, electromagnetically coupled to first and second slot lines at both ends of these slot lines; and fifth and sixth microstrip lines, the top end sides thereof traversing the first and second slot lines, respectively, so as to be electromagnetically coupled to the first and second slot lines.Type: GrantFiled: May 25, 2005Date of Patent: August 22, 2006Assignees: Saga University, Nihon Dempa Kogyo Co., Ltd.Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Patent number: 6992635Abstract: A planar array antenna comprises a powered antenna element and an adjacent passive element which are microstrip-line type ones and disposed on one principal surface of a dielectric substrate; and a feeding system for feeding high frequency power to the powered antenna element. The powered antenna element and a passive element disposed ahead of the powered antenna element constitute a powered element pair, and the adjacent passive element and a passive antenna element disposed ahead of the adjacent passive element constitute a passive element pair. The passive element pair is disposed so that it adjoins said powered element pair in an electric field direction or a magnetic field direction of radio wave emitted from the powered antenna element.Type: GrantFiled: January 28, 2005Date of Patent: January 31, 2006Assignees: Nihon Dempa Kogyo Co., Ltd., Saga UniversityInventors: Eisuke Nishiyama, Masayoshi Aikawa, Fumio Asamura, Takeo Oita
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Publication number: 20050264451Abstract: A planar array antenna using a multi-layer substrate having an intermediate layer conductor in a laminated face comprises: four pieces of planar antenna elements disposed at each of geometrically square shaped apexes; first and second slot lines formed in the intermediate layer conductor, and intersecting each other; first to fourth microstrip lines formed along each side of geometrical squares so as to be coupled to each antenna element, and at the same time, electromagnetically coupled to first and second slot lines at both ends of these slot lines; and fifth and sixth microstrip lines, the top end sides thereof traversing the first and second slot lines, respectively, so as to be electromagnetically coupled to the first and second slot lines.Type: ApplicationFiled: May 25, 2005Publication date: December 1, 2005Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Publication number: 20050264450Abstract: A planar array antenna comprises a powered antenna element and an adjacent passive element which are microstrip-line type ones and disposed on one principal surface of a dielectric substrate; and a feeding system for feeding high frequency power to the powered antenna element. The powered antenna element and a passive element disposed ahead of the powered antenna element constitute a powered element pair, and the adjacent passive element and a passive antenna element disposed ahead of the adjacent passive element constitute a passive element pair. The passive element pair is disposed so that it adjoins said powered element pair in an electric field direction or a magnetic field direction of radio wave emitted from the powered antenna element.Type: ApplicationFiled: January 28, 2005Publication date: December 1, 2005Inventors: Eisuke Nishiyama, Masayoshi Aikawa, Fumio Asamura, Takeo Oita
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Publication number: 20050200530Abstract: A slot-line planar antenna has a substrate, an outer conductor disposed on one principal surface of the substrate and having an opening defined therein, an inner conductor disposed on the one principal surface of the substrate and positioned within the opening, the outer conductor and the inner conductor jointly defining a looped aperture line therebetween, and an electronic device electrically interconnecting the outer conductor and the inner conductor for controlling an electromagnetic wave field of a slot line provided by the aperture line.Type: ApplicationFiled: January 28, 2005Publication date: September 15, 2005Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Patent number: 6917332Abstract: A multielement planar antenna has a substrate, a plurality of antenna element pairs disposed on a first main surface of said substrate, each of the antenna element pairs including first and second antenna elements each made of a circuit conductor, a metal conductor disposed on a second main surface of the substrate, and a slot line defined in the metal conductor. Each of the antenna element pairs has a microstrip line interconnecting the first and second antenna elements. The slot line crosses the microstrip lines and is electromagnetically coupled to the microstrip lines for feeding the first and second antenna elements. The slot line is fed at its central area by a microstrip line or a coplanar line.Type: GrantFiled: October 2, 2002Date of Patent: July 12, 2005Assignees: Nihon Dempa Kogyo Co., Ltd.Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Kozo Egashira, Fumio Asamura, Takeo Oita
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Patent number: 6825816Abstract: A two-element slot line array antenna comprises a substrate having a first and a second main surface, a conductor disposed on the first main surface, a slot line formed in the conductor, and a pair of slot line antenna elements formed in the conductor. The slot line has one end side electromagnetically coupled to the pair of antenna elements, and the other end side serving as a feed end. The pair of antenna elements is arranged in parallel with an electric field plane or a magnetic field plane formed by the slot line. The pair of antenna elements and the slot line are arranged in mirror symmetry with respect to a magnetic field plane or electric field plane which starts at the feed end, so that the pair of antenna elements is excited in phase.Type: GrantFiled: April 24, 2003Date of Patent: November 30, 2004Assignees: Nibon Dempa Kogyo Co., Ltd.Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Patent number: 6798319Abstract: A high-frequency filter for use in a superhigh frequency band such as of microwaves and millimeter waves has a substrate, a metal conductor disposed on a first main surface of the substrate, a resonator comprising a transmission line of a coplanar structure which is made of the metal conductor, and input and output lines disposed on a second main surface of the substrate transversely across the resonator and electromagnetically coupled to the resonator. The resonator may be a coplanar line resonator (coplanar waveguide resonator) or a slot line resonator. The high-frequency filter has a steep attenuating gradient in filter characteristics. The high-frequency filter may be combined with variable-reactance devices such as variable-capacitance diodes for electronically controlling the filter characteristics.Type: GrantFiled: October 2, 2002Date of Patent: September 28, 2004Assignees: Nihon Dempa Kogyo Co., Ltd.Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Yoshifumi Kawamura, Fumio Asamura, Takeo Oita
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Patent number: 6798384Abstract: A multi-element planar array antenna has a substrate made of a dielectric material or the like; a planar conductor formed on a first principal surface of the substrate; a first and a second slot line formed in the conductor and intersecting each other; a first and a second microstrip line formed on a second principal surface of the substrate, and traversing the first slot line respectively at positions corresponding to both end sides of the first slot line; a third and a fourth microstrip line formed on the second principal surface, and traversing the second slot line respectively at positions corresponding to both end sides of the second slot line; and four slot line antenna elements formed on the first principal surface respectively in intersection regions between both end sides of the first and second microstrip lines and both end sides of the third and fourth microstrip lines.Type: GrantFiled: April 24, 2003Date of Patent: September 28, 2004Assignees: Nihon Dempa Kogyo Co., Ltd., Masayoshi AikawaInventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Patent number: 6756857Abstract: A planar circuit has a substrate, a planar circuit conductor disposed on a first main surface of the substrate, a ground conductor disposed on a second main surface of the substrate for creating a high frequency resonator based on an electromagnetic wave field in cooperation with the planar circuit conductor, and a circuit element disposed on an opening formed in at least one of the planar circuit conductor and ground conductor to electronically control the electromagnetic wave field. The circuit element may be a variable reactance element such as a varactor diode, or a switching element. The circuit element can variably control the electromagnetic wave field which defines the resonator, so that the resonator can be controlled, for example, to resonate at a variable frequency.Type: GrantFiled: September 26, 2002Date of Patent: June 29, 2004Assignees: Nihon Dempa Kogyo Co., Ltd.Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Takayuki Tanaka, Fumio Asamura, Takeo Oita
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Patent number: 6753817Abstract: A multi-element planar array antenna has a ground conductor formed on a first principal surface of the substrate, a first and a second slot line formed in the ground conductor and intersecting each other, a first and a second microstrip line formed on a second principal surface of the substrate, and traversing the first slot line respectively at positions corresponding to both end sides of the first slot line, a third and a fourth microstrip line formed on the second principal surface, and traversing the second slot line respectively at positions corresponding to both end sides of the second slot line, and four antenna elements of microstrip line type formed respectively in intersection regions between both end sides of the first and second microstrip lines and both end sides of the third and fourth microstrip lines, respectively, on the second principal surface.Type: GrantFiled: December 23, 2002Date of Patent: June 22, 2004Assignee: Nihon Dempa Kogyo Co., Ltd.Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Publication number: 20040041732Abstract: A multielement planar antenna has a substrate, a plurality of antenna element pairs disposed on a first main surface of said substrate, each of the antenna element pairs including first and second antenna elements each made of a circuit conductor, a metal conductor disposed on a second main surface of the substrate, and a slot line defined in the metal conductor. Each of the antenna element pairs has a microstrip line interconnecting the first and second antenna elements. The slot line crosses the microstrip lines and is electromagnetically coupled to the microstrip lines for feeding the first and second antenna elements. The slot line is fed at its central area by a microstrip line or a coplanar line.Type: ApplicationFiled: October 2, 2002Publication date: March 4, 2004Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Kozo Egashira, Fumio Asamura, Takeo Oita
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Publication number: 20030201941Abstract: A multi-element planar array antenna has a substrate made of a dielectric material or the like; a planar conductor formed on a first principal surface of the substrate; a first and a second slot line formed in the conductor and intersecting each other; a first and a second microstrip line formed on a second principal surface of the substrate, and traversing the first slot line respectively at positions corresponding to both end sides of the first slot line; a third and a fourth microstrip line formed on the second principal surface, and traversing the second slot line respectively at positions corresponding to both end sides of the second slot line; and four slot line antenna elements formed on the first principal surface respectively in intersection regions between both end sides of the first and second microstrip lines and both end sides of the third and fourth microstrip lines.Type: ApplicationFiled: April 24, 2003Publication date: October 30, 2003Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Publication number: 20030201944Abstract: A two-element slot line array antenna comprises a substrate having a first and a second main surface, a conductor disposed on the first main surface, a slot line formed in the conductor, and a pair of slot line antenna elements formed in the conductor. The slot line has one end side electromagnetically coupled to the pair of antenna elements, and the other end side serving as a feed end. The pair of antenna elements is arranged in parallel with an electric field plane or a magnetic field plane formed by the slot line. The pair of antenna elements and the slot line are arranged in mirror symmetry with respect to a magnetic field plane or electric field plane which starts at the feed end, so that the pair of antenna elements is excited in phase.Type: ApplicationFiled: April 24, 2003Publication date: October 30, 2003Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Publication number: 20030122715Abstract: A multi-element planar array antenna has a ground conductor formed on a first principal surface of the substrate, a first and a second slot line formed in the ground conductor and intersecting each other, a first and a second microstrip line formed on a second principal surface of the substrate, and traversing the first slot line respectively at positions corresponding to both end sides of the first slot line, a third and a fourth microstrip line formed on the second principal surface, and traversing the second slot line respectively at positions corresponding to both end sides of the second slot line, and four antenna elements of microstrip line type formed respectively in intersection regions between both end sides of the first and second microstrip lines and both end sides of the third and fourth microstrip lines, respectively, on the second principal surface.Type: ApplicationFiled: December 23, 2002Publication date: July 3, 2003Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Fumio Asamura, Takeo Oita
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Publication number: 20030102942Abstract: A high-frequency filter for use in a superhigh frequency band such as of microwaves and millimeter waves has a substrate, a metal conductor disposed on a first main surface of the substrate, a resonator comprising a transmission line of a coplanar structure which is made of the metal conductor, and input and output lines disposed on a second main surface of the substrate transversely across the resonator and electromagnetically coupled to the resonator. The resonator may be a coplanar line resonator (coplanar waveguide resonator) or a slot line resonator. The high-frequency filter has a steep attenuating gradient in filter characteristics. The high-frequency filter may be combined with variable-reactance devices such as variable-capacitance diodes for electronically controlling the filter characteristics.Type: ApplicationFiled: October 2, 2002Publication date: June 5, 2003Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Yoshifumi Kawamura, Fumio Asamura, Takeo Oita
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Publication number: 20030062963Abstract: A planar circuit has a substrate, a planar circuit conductor disposed on a first main surface of the substrate, a ground conductor disposed on a second main surface of the substrate for creating a high frequency resonator based on an electromagnetic wave field in cooperation with the planar circuit conductor, and a circuit element disposed on an opening formed in at least one of the planar circuit conductor and ground conductor to electronically control the electromagnetic wave field. The circuit element may be a variable reactance element such as a varactor diode, or a switching element. The circuit element can variably control the electromagnetic wave field which defines the resonator, so that the resonator can be controlled, for example, to resonate at a variable frequency.Type: ApplicationFiled: September 26, 2002Publication date: April 3, 2003Inventors: Masayoshi Aikawa, Eisuke Nishiyama, Takayuki Tanaka, Fumio Asamura, Takeo Oita